fork (fork) a pronged instrument.
tuning fork
replication fork a site on a DNA molecule at which unwinding of the helices and synthesis of daughter molecules are both occurring. 
)
Replication fork, showing simultaneous synthesis of both strands; since synthesis occurs in the 5′ to 3′ direction, one strand, the leading strand, can be synthesized continuously while the other, the lagging strand, must be synthesized discontinuously in short fragments (Okazaki fragments) which are later joined.
tuning fork a device that produces harmonic vibration when its two prongs are struck; used to test hearing and bone conduction.
tuning fork
[t(y)o̅o̅′ning]
Etymology: Gk, tonos, stretching; L, furca, fork
a small metal instrument consisting of a stem and two prongs that produces a constant pitch when either prong is struck. It is used by physicians as a screening test of air and bone conduction.
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